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Asymmetric cooling (driver/passenger different temperature)

Q: How to fix Asymmetric cooling (driver/passenger different temperature) in BMW F15)?

An effective repair involves replacing the entire heater valve module (Heater Control Valve) under the hood with a new one. High failure rate, the defect becomes visible on a mass scale when these vehicles reach the age of 7-8 years.

in BMW F15) (2007-2018)

Symptoms

Different temperature on both sides of the cabin

DTC error codes

Brak

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Technical diagnosis (Premium)

Recognized technical fault:

Auxiliary controller voltage instability detected

Technical analysis

Detailed analysis of HVAC controller operation parameters, CAN bus data readings, and diagnostic signal waveforms. Purchase PRO access or log in to read the full fault analysis.

Confirmed solution

Complete step-by-step repair procedure including module non-volatile memory reset, sensor calibration, and correct wiring routing. Unlock the full report to see the instruction.

Parts needed

Filters ferrite anti-interference / noise suppressor
Auxiliary starting battery (depending on cell status)

Workshop hacks

Important workshop tips for mechanics regarding bypasses without expensive control module replacement and manufacturer software service bulletins.

TSB / TPI service bulletins

TSB-24-HVAC-01TPI-2068943/2

A/C Technical Specifications

Refrigerant specifications for this model are available in the catalog.

Open refrigerant database

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